Automatic stopping device for talking machines



April 25, 1933. G, CLARK 1,905,151

AUTOMATIC STOPPING DEVICE FOR TALKING MACHINES,

Filed April 27, 1929 2 Sheets-Sheet 1 Smentor April 25, 1933. G. F. CLARK 1,905,151

AUTOMATIC STOPPING DEVICE FOR TALKING MACHINES Filed April 27, 1929 2 Sheets-Sheet 2 1/ j L I2 8 k /0 7 22 omentcr 14 WW, Mm

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Patented Apr. 25, 1933 UNITED STATES CORPORATION OF DELAWARE (molten rnnnnmcx CLARK; or wEs'r DRAYTON, EncLAnD, ASSiG-NOR, ifw imsrm ASSIGNMENTS, 'ro RADIO OORJOEATION or AMERICA, or NEW YORK, N. Y A

AUTOMATIC STOPPING DEVICE iron TALKING ma mas Application filed April 27, 1929, Serial no; 358,653, and in Great Britain has is, i928.

This invention relates to improvements in automatic stopping devices for talking mae chines and in particular to stopping devices of the kind which are operable to stop the machine when the direction of movement of the sound arm is reversed as by the engagement of the stylusin an eccentric grooveprovlded at the centre of the record. The invention is particularly adapted for use in conjunction with means operable to stop the machine by friction upon the turntable spindle or the central boss of the turntable.

The stopping'me'ans according to the invention comprises a movableme'mber adapted to be moved in conjunction with the sound arm, a second movable member in frictional engagement with the first movable member, said second movable member being adapted to remain stationary during movement of the sound arm and the first movable member in one direction and to be moved to operate a stop member when the sound arm and first movable member are moved in the other direction.

The stop member comprises a pivotally mounted lever which is movable first in one direction and then in the other direction during movement of the sound arm in one direction only.

In the preferred construction the stopping member in the stopping position engages with a radial extension on a sleeve in frictional engagement with the central boss beneath the turntable whereby movement of the sleeve is prevented andthe turntable is brought to a standstill by friction. I

The invention is illustrated by way of example in the accompanying drawings in which,

Fig. 1 is a'plan view with the parts in the stopping position.

Fig. 2 is a plan vieu with the parts in the ofi position.

' Fig. 3 is an elevation of the braking mechanism detached from the machine.

Figs. 4 and 5 are detail views of the parts of the braking mechanism carried on the turntable spindle.

Referring to the drawings, 1 is the usual turntable spindle driven by the motor of the machine and carrying the usual turntable 2 indicated in dotted lines in Fig. 1. The soundarm 3 is pivoted at 4: on the machine and carries the usual reproducer 5'. Upon the vertical portion ofthe pivoted sound ar-m 3is fixed a lever 6 carrying a pin 7which co-operates with a lever 8 pivoted at 9 on a base plate 10. The pin 7 operates to move lever 8 through a pair. of spring connected jaws 11, 12, by reason of the fact that jaw 12 is integral with lever 3. 9

Upon the same pivot 9 is mounted a lever 13 which is held in frictional engagement with lever 8 through a spring washer 14 so that it moves therewith "when free to do so,

The outer end of the lever 13 is bifurcated as shown at-l5 and engageswith a pin 16 upstanding from a stop lever 17 pivoted at 18 on the base plate, and this stop lever 17 is capable of movement about its pivot 18 between extreme positions where it contacts with one or other of two stops 19; 20 on the base plate. I

The end of stop lever 17 is formed with an extension 21, the edge of which foir'ns a cam surface for engagement by a'pin 22 in the extremity of lever 8.

The c'entral'bo'ss 23 on the underside of the turntable 2 is in the form of a cup apertured at the bottom as shown at 24 for the passage of the turntable spindle 1 andprovided with an outwardly directed flange 25 whereby connection to the turntable 2 may be eflected as by spot welding for example.

' A recess 26 is formed-at the lower end of the boss which engages a pin, not showman the turntable spindle in usual manner to ensurerotation of the turntable with the spindle. Inthe walls "of thee-1p forming boss 23 are provided a number-. threefor ample, of spaced apertures in which are housed pads 27 of fibre or" the like and these pads are held in position by means of a spring ring- 28 within the boss and en aging in sharlow recesses in the inner surfaces of the pads 27. The spring ring serves also to in e the pads radially outwards into frictiona con tact with the inner surface of a sleeve 29 be recessed on its inner surface shown at member 17 referred to above.

The operation is as follows:

Assuming the stylus of the reproducer 5 to be engaged'with arecord being played.

Inthese conditions the lever 8 is being rocked in a counterclockwise direction about its pivot 9 and lever 13 tends torotate in the same direction by virtue of its frictional connection through friction washer 14 with lever 8. The lever l3 however,is connected through pin 16 With-stop lever 17 and holds said stop lever in contact with stop 20 by virtue of its tendency to move with the lever 8. In consequence lever 13 is held against movement and slip takes place between levers 8 and 13. Whenthe end of the recordis reached and a reversal of the direction of movement of the soundjarm 3 is effected, as by the stylus entering-an eccentric groove 32, the lever 8 is moved'in a clockwise direction about its pivot 9 and lever 13 moves in thesame direction by virtuegof its frictional connection with lever 8 throughwasher 14 and the stop lever 17 is moved from the position shown in r Fig. 2 to the position shown in Fig. 1 where its end engages one of the projecting lugs 31 on sleeve 29. The sleeve 29 is brought at once to a standstill and the rotation of the turntable ceases through the frictional engagement between the pads 27 and the sleeve 29. o

Subsequent movement of the sound arm 3 outwards causes lever 8 to rock further in a clockwise direction and pin 22 on lever 8 engages the cam surface on extension 21 of lever 17 as shown in Fig. 2 whereby the lever 17 is returned to the non-stopping position against stop 20 due to slippage again taking place between lever 8 and lever 13, as the latter moves into the position which it occupies during playing. I

I claim: I 1. Automatic stopping means for a talking machine comprising a movable member adapted to be moved in conjunction with the sound arm, a stopping member movable between stopping and non-stopping posimember and connected to said stopping member to move the latter, means for holding said second member stationary during movementof the sound arm and first member in one direction, and meansoperative upon movement of said sound arm in .the other direction to move said stopping member into non-stopping position independently of said second member.

2. Automatic stopping means for a talking machine comprising a movable member adapted to be moved in conjunction with the sound arm, a stoppingmember movable between stopping and non-stopping positions, an operating member having frictional engagement with said movable member and pivotal engagement with said stopping member, and means holding said operating member stationary with said stopping member in nonstopping positionduring movement of'said sound arm in one direction-.- H

3. Automatic stopping means for a talking machine comprising a movable member adapted to be moved in conjunction with the sound arm, a stopping member movable between stopping and non-stopping positions, an operating member having frictional engagement-with said movable member and pivotal engagement with said stopping member, means holding said operating member stationary with said stopping member in'nonstopping position during movement of said sound arm in one direction, said operating member being: movable with saidi movable member when the sound. arm.movesin* the opposite direction ,to move, said stopping member to stopping position, and meansfron said movable member-operable on continued movement of'said'sound arm in saidopposite direction to move said operating member and stopping member to non-stopping position. 4 Automatic stopping means for a talking machine comprising a pivoted stop member, a member movable in conjunction with the sound arm, and a second member having frictional engagement with said first member, said second member being adapted to move said stop member in one direction and said first member being adapted to move said stop member in the opposite direction as said sound arm ismoved in one direction only.

5. Automatic stopping means for a talk- 7 ing machine comprising a pivoted stop member, a member movable in conjunction with the sound arm, and a second member having frictional engagement with said first member, said second member being adapted to move said stop member to stopping position as said sound arm moves outwardly and said first member being adapted to move said stop member to non-stopping position upon further movement of said sound arm outwardly. 6. Automatic stopping means for a talking machine comprising-a pivoted stop member, a member movable in conjunction with the sound arm, and a second member having frictional engagement with said first member and pivotal engagement with said stop member, said second member being adapted. to move said stop member to stopping position as said sound arm moves outwardly and said stop member having a cam surface adapted to beengaged by said first member on continued movement of said sound arm. outwardly to move said stopping member to nonstopping position. j 7 A I v 7. In apparatus of the class described, the combination of a turntable having a hollow boss, a sleeve surrounding said boss, means carried by said boss and frictionally engaging said sleeve, a radial projection on said sleeve, a stop member movable into and out of the path of movement of said projection, and means movable in conjunction with the sound arm for moving said stop member into and out of the path of movement of said projection.

8. In a talking machine, the combination of a turntable having a hollow boss and an aperture in the wall of said boss, a sleeve surrounding said boss, a friction element in said aperture, means yieldingly urging said element into frictional engagement with said sleeve, a radial projection on said sleeve, a pivoted stop member movable into and out of the path of movement of said projection, and means movable in conjunction with the sound arm for operating said stop member.

9. In a phonograph, the combination with a turntable of an annular brake sleeve having operative frictional engagement with said turntable and normally rotatable therewith, a stop mechanism including a brake engaging member and a pivoted lever operable by and upon a reverse movement of the tone arm to move said member into and out of the path of said brake sleeve.

i said turntable and normally rotatable therewith, means actuated by said tone arm upon a limited reverse movement thereof at a point adjacent the center of said turntable in its normal direction of movement for causing the application of said brake, and means controlled by said tone arm upon a complete movement of said tone arm in said reverse direction for releasing said brake.

11. In a phonograph having a sound reproducing instrumentality, the combination with a record-support including a boss thereon and a driving spindle for said support of automatic stopping means comprising a sleeve adapted to be driven by said spindle and having operative frictional engagement with said boss, radial projections carried by said sleeve, a stop member movable into and out of the path of movement of said projections, means movable in conjunction with said instrumentality for moving said stop member into and out of the path of movement of said projections, and means connecting said stop member and said last named means whereby motion may be transmitted to said stop member by said instrumentality.

12. In a phonograph including a pivotally supported tone arm and a turntable having a boss thereon, a brake sleeve having operative frictional engagement with said boss and normally rotatable therewith, means actuated means comprising a projection frictionally engaging and being rotatable with said boss, a pivoted stop member movable into the path of movement of said projection, means movable in conjunction with the sound arm for moving said stop member into and out of the path of movement of said projection, and means connecting said stop member and said last named means whereby motion may be transmitted to said stop member by said sound arm.

14. In a phonograph including a sound reproducing instrumentality, the combination with a record support having a boss thereon, of automatic stopping means comprising a sleeve having operative frictional engagement with said boss, radial projections on said sleeve, a stop member movable into and out of the path of movement of said projections, means movable in conjunction with said instrumentality for moving said stop member into and out of the path of movement of said projections, and means connecting said stop member and said last named vmeans whereby motion may be transmitted to said stop member by said instrumentality.

15. In a phonograph, a rotatable record- In testimony whereof I have signed my name to this specification.

GEORGE FREDERICK CLARK. 

